dt-bindings: hwmon: add microchip,emc2305.yaml dt binding description.

Submitted to linux-hwmon mailing list at
https://patchwork.kernel.org/project/linux-hwmon/patch/20220430114905.53448-3-michaelsh@nvidia.com/

Add basic description of emc2305 driver device tree binding.

Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>

diff --git a/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
new file mode 100644 (file)
index 0000000..52ae4c2
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/microchip,emc2305.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+
+$id: http://devicetree.org/schemas/hwmon/emc2305.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip EMC2305 RPM-based PWM Fan Speed Controller
+
+properties:
+  compatible:
+    enum:
+      - microcip,emc2305
+
+  emc2305,pwm-min:
+    description:
+      Min pwm of emc2305
+    maxItems: 1
+  emc2305,pwm-max:
+    description:
+      Max pwm of emc2305
+    maxItems: 1
+  emc2305,pwm-channel:
+    description:
+      Max number of pwm channels
+    maxItems: 1
+  emcs205,max-state:
+    description:
+    maxItems: 1
+  emc2305,cooling-levels:
+    description:
+      Quantity of cooling level state.
+    maxItems: 1
+
+required:
+  - compatible
+
+optional:
+  - emc2305,min-pwm
+  - emc2305,max-pwm
+  - emc2305,pwm-channels
+  - emc2305,cooling-levels
+
+additionalProperties: false
+
+examples:
+  - |
+    fan {
+        emc2305,compatible = "microchip,emc2305";
+        emc2305,pwm-min = <0>;
+        emc2305,pwm-max = <255>;
+        emc2305,pwm-channel = <5>
+        emc2305,cooling-levels = <10>;
+    };